I’m sure your friend is sincere when she says this — but unfortunately she is wrong. I may follow a roadmap when I’m taking a trip, but if it’s the wrong roadmap I’ll never arrive at my destination — no matter how sincere I am.
In my experience, such “prophecies” are usually the product of someone’s vivid imagination, and nothing more. They often are rather vague and open to all kinds of interpretations — but even when they are specific, they seldom come true. If you looked at these “prophecies” a year after they were written, very few of them actually took place. The Bible speaks of a time when “impostors will go from bad to worse, deceiving and being deceived” (2 Timothy 3:13). Perhaps we are living in those days.
The main problem, however, is that these things have led your friend away from God and His truth. God has given us His Word, the Bible, and it alone tells us how to live and gives us hope for the future. It also tells us how we can have our sins forgiven and come to know God in a personal way. No man-made “prophecy” can ever do this.
Pray for your friend, and encourage her to put her trust in Christ alone. And if you have never faced your own need of God, turn to Jesus and give your life to Him. Jesus said, “Whoever follows me … will have the light of life” (John 8:12).